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Diffstat (limited to 'lib/libc/powerpc64/gen/makecontext.c')
-rw-r--r--lib/libc/powerpc64/gen/makecontext.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/libc/powerpc64/gen/makecontext.c b/lib/libc/powerpc64/gen/makecontext.c
index 75c2d40bdd60..9e3a976fa1bd 100644
--- a/lib/libc/powerpc64/gen/makecontext.c
+++ b/lib/libc/powerpc64/gen/makecontext.c
@@ -78,7 +78,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
*/
stackargs = (argc > 8) ? argc - 8 : 0;
sp = (char *) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size
- - sizeof(uintptr_t)*(stackargs + 2);
+ - sizeof(uintptr_t)*(stackargs + 6);
sp = (char *)((uintptr_t)sp & ~0x1f);
mc = &ucp->uc_mcontext;
@@ -119,6 +119,7 @@ __makecontext(ucontext_t *ucp, void (*start)(void), int argc, ...)
mc->mc_srr0 = *(uintptr_t *)_ctx_start;
#else
mc->mc_srr0 = (uintptr_t) _ctx_start;
+ mc->mc_gpr[12] = (uintptr_t) _ctx_start;/* required for prologue */
#endif
mc->mc_gpr[1] = (uintptr_t) sp; /* new stack pointer */
mc->mc_gpr[14] = (uintptr_t) start; /* r14 <- start */